What this MCCB delivers — and what the ratings mean for your panel
The Siemens 3VA2225-7JQ42-0DC0 is a 4-pole SENTRON molded case circuit breaker (MCCB) rated 250 A continuous current, with an ETU560 electronic trip unit. This is a line-protection breaker — not a motor-protection device — sized for feeder or main breaker duty in distribution panels. Its interrupting ratings tell the real story: 330 kA at 240 V, 242 kA at 415 V, and 4.5 kA at 690 V. At 240 V and 415 V this is a high-interrupting-capacity (HIC) MCCB — it can sit upstream of a fault without needing a current-limiting fuse ahead of it, simplifying coordination. At 690 V the 4.5 kA rating is lower but still adequate for most 690 V distribution where the available fault current is below that threshold. Rated insulation voltage is 800 V, so the breaker is suitable for 690 V systems with margin. The ETU560 provides LSIG (long-time, short-time, instantaneous, ground-fault) protection; ground-fault sensing uses summation current on L+N conductors. Power dissipation is 55 W maximum at rated current — factor that into enclosure thermal calculations, especially in a multi-breaker lineup. Dimensions are 140 mm wide, 181 mm high, 107 mm deep — a standard 4-pole MCCB footprint that fits most SENTRON panelboards and switchboard chassis without modification.
Integration and wiring notes
The breaker ships with an undervoltage release (UVR) and two HQ auxiliary switches. The UVR coil must be energized for the breaker to close — a standard safety interlock for emergency-stop circuits. Auxiliary contacts provide status feedback to a PLC or annunciator panel. IP40 protection on the front means the breaker is touch-safe against tools and wires but not sealed against dust ingress — suitable for indoor panel mounting only. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Current derating is needed above 55 °C: 240.625 A at 55 °C, 231.25 A at 60 °C, 221.875 A at 65 °C, and 212.5 A at 70 °C. At 40 °C, 45 °C, and 50 °C the breaker holds full 250 A rating.